How to understand mortgage term "double pay extra payment on regular payment date"?

[longshan]

Just renewed mortgage, there is an option for prepayment shows:
"pay an extra regular payment (principal, interest and taxes) on any regular payment date"
does it mean(without consider compound interest):
regular payment: bi-weekly payment $500, includes $400 towards principal, $100 interest
includes an extra payment: bi-weekly $1000, includes $800 toward principal, $200 interst, which means two years payments can be made in a year within allowed limitation? then, the mortgage term deemed be a year longer.

 

[kukululu]

我的理解是 如果付1000 (500+500)，其中100利息不变，剩余900付在principal

 

[dkwan]

Just renewed mortgage, there is an option for prepayment shows:
"pay an extra regular payment (principal, interest and taxes) on any regular payment date"
does it mean(without consider compound interest):
regular payment: bi-weekly payment $500, includes $400 towards principal, $100 interest
includes an extra payment: bi-weekly $1000, includes $800 toward principal, $200 interst, which means two years payments can be made in a year within allowed limitation? then, the mortgage term deemed be a year longer.

All payment(s) additional to regular payment on regular payment date will go towards your mortgage principle.

 

[dkwan]

Just renewed mortgage, there is an option for prepayment shows:
"pay an extra regular payment (principal, interest and taxes) on any regular payment date"
does it mean(without consider compound interest):
regular payment: bi-weekly payment $500, includes $400 towards principal, $100 interest
includes an extra payment: bi-weekly $1000, includes $800 toward principal, $200 interst, which means two years payments can be made in a year within allowed limitation? then, the mortgage term deemed be a year longer.

In your early mortgage stage, any additional $1 go towards your principle will be saved about $0.8 in interest at the whole mortgage term.